Driving apparatus

• US 7,671,502 B2
• Filed: 07/24/2008
• Issued: 03/02/2010
• Est. Priority Date: 04/12/1996
• Status: Expired due to Fees

• Current Assignee: Hitachi Car Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Original Assignee: Hitachi Car Engineering Company Limited (Hitachi, Ltd.), Hitachi, Ltd.
• Inventors: Oda, Keijiro, Shibukawa, Suetaro, Matsunobe, Yutaka, Kawamata, Shouichi, Koizumi, Osamu, Tajima, Fumio
• Primary Examiner(s): Nguyen; Tran N
• Application Number:
  US12/179,253
• Publication Number:
  US 20080284270A1
• Time in Patent Office: 586 Days
• Field of Search: 310/166, 310/168, 310/180, 310/184, 310/156.53, 310/156.56, 310/216
• US Class Current: 310/156.53
• CPC Class Codes: B60L 15/025 using field orientation; Vector control; Direct Torque Control [DTC]
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: H02K 1/246 Variable reluctance rotors
• CPC Class Codes: H02K 1/276 Magnets embedded in the magnetic core, e.g. interior permanent magnets [IPM]
• CPC Class Codes: H02K 19/103 Motors having windings on the stator and a variable reluctance soft-iron rotor without windings
• CPC Class Codes: H02K 21/16 having annular armature cores with salient poles with homopolar co-operation H02K21/20
• CPC Class Codes: H02K 2213/03 Machines characterised by numerical values, ranges, mathematical expressions or similar information
• CPC Class Codes: H02K 29/03 with a magnetic circuit specially adapted for avoiding torque ripples or self-starting problems
• CPC Class Codes: H02K 3/28 Layout of windings or of connections between windings windings for pole-changing H02K17/06, H02K17/14, H02K19/12, H02K19/32
• CPC Class Codes: Y02T 10/64 Electric machine technologies in electromobility

Abstract

A rotating electric machine comprises a stator having stator salient poles, three-phases windings would around said stator salient poles, a rotor rotatable held inside the said stator, and permanent magnets inserted into said rotor and positioned opposite to said stator salient poles. The three-phase windings are concentratively wound around each of the stator salient poles, with windings of each phase wound around at more than one stator salient pole. The windings of each phase have a phase difference of voltage between at least one of the windings and the other.

Claims

1. A permanent magnet electric rotating machine, comprising:

a stator;

a rotor arranged opposite said stator with a rotation air gap in between, said rotor having a rotor iron core;

a plurality of permanent magnets embedded in said rotor iron core and arranged in the peripheral direction in said rotor;

magnetic pole piece portions disposed in said rotor, between said permanent magnets and the periphery of said rotor;

wherein a radius of said rotor is larger at the respective magnetic pole piece portions than it is at a circumferential center of an iron core portion between adjacent permanent magnets in said rotor core.

3. A permanent magnet electric rotating machine according to claim 1, wherein a stator winding is wound around a stator salient pole portion in a concentrated manner.

4. A permanent magnet electric rotating machine according to claim 1, wherein a three phase winding is wound around a stator salient pole portion.

5. A permanent magnet electric rotating machine according to claim 1, wherein an axial cross section of said magnets is rectangular.

6. A permanent magnet electric rotating machine according to claim 1, wherein the number of the magnets is one of 8 and 10.

7. A permanent magnet electric rotating machine according to claim 1, wherein the ratio of number of the magnets to number of stator poles is 2:

3.

8. A permanent magnet electric rotating machine according to claim 1, wherein said permanent magnets are magnetized with alternating magnetic polarity.

9. A vehicle having a permanent magnet electric rotating machine according to claim 1.

2. A permanent magnet electric rotating machine, comprising:

a stator;

a rotor arranged opposite said stator with a rotation air gap in between, said rotor having a rotor iron core;

a plurality of permanent magnets embedded in said rotor iron core, and arranged in the peripheral direction in said rotor;

magnetic pole piece portions disposed in said rotor between said permanent magnets and the periphery of said rotor;

wherein said rotor has axially extending depressions in a periphery thereof, at locations adjacent areas between said permanent magnets.